Expert By SamK on November 30, 2023 Category(s)World and PlanetsTopic(s)Stenian PeriodEarth PeriodsEarth1,200 M - 1,000 M YearsThe time span of Stenian period was 1,200 million years to 1,000 million years ago, while it's duration was approx. 200 million years.
